Ammonia-still.



H. S DAVIS. AMMONIA STILL.

. m V .APILIUATION FILED JAN. 27, 1908. 1m 5,140.".

2 SHEETSSHEET 2.

M M /4 5-5 33 3g 44 52 K 4/ w 45 4? V /0 A 23' 2/ 7 [7206722071 Zh'irzesses:

Patented Jan. 16, 1912.

gases from a boiler furnace.

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' suitable manner.

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HARRY S. DAVIS, OF BUFFALO, NEW YORK,-

ASSIGNOR OF ONE-HALF KNOWLTON, OF'BUFFALO, NEW YORK.

AMMONIA-STILL.

Patented Application filed January 27, 1908. Serial no. 412,697.

To all whom', it may concern Be it known that I, HARRY S. DAVIS, a citizen of the United States, residing at Buffalo, in the county of Erie and State of New York, have invented a new and useful Improvement in Ammonia-Stills, of which the following is a specification.

This invention relates to ammonia stills, such as are used, for instance, in the absorption process of refrigeration in which during the cycle of operations the expanded ammonia gas, after having exerted its 'refrigerat-i-ng effect, is absorbed by weak aqua ammonia, and the strong aqua ammonia so formed is conveyed to a still or generator in which the ammonia gas is separated from the water by the application of heat.

The object of my invention is to heat the ammonia still or generator in an efiicient and inexpensive way and to that end the still is heated by the hot waste gases or products of combustion of a steam boiler or internal combustion engine, the supply of such waste heat to the still or generator being soregulated that the desired temperature is maintainedvwithout danger of overheating the still. I

In the accompanying drawings, consisting of two sheets: 4 Figure 1 is a diagrammatic illustration, partly in section, of a refrigerating system embodying this invention in which the still is heated by the waste Fig. 2 is a sectional elevation of the still and connecting parts of a system in which the waste gases from an internal combustion engine are utilized for heating the still.

Like reference characters refer to like parts in both figures.

Referring to Fig. 1, A represents the ammonia still which may of any suitable or well known construction and which is combined with the usual members of an absorption system of refrigeration in any usual or The additional members illustrated in the figure are the following: B represents the exchanger which is'provided with a coil to which the weak liquor is conducted from the still by a pipe 10. C represents the absorber to which the weak liquor flows from the exchanger B through a pipe 11 and in which this liquor is sprayed and brought into contact with the ammonia gas which is supplied to the absorber by a pipe 12. The weak liquor absorbs the gas deposits entrained rum ora ion.

TO DANIEL E.

Jan. 16, 1912.

.andthe strong liquor so formed is pumped pump 13 and pipe analyzer through the still and in liquid. The

liquor passes from the exchanger B to the analyzer to the still. The gas passe lyzer D by a pipe 16 to the from the latter by a pipe densers F and to the. cooler by a pipe 15 and from the analyzer s from the anarectifying coil E,

17 to the confrom 'the'latter by a pipe 18 G in which the liquefied gas expands and cools the refrigerating solution the coil in the which circulates through cooler'and the therewith. The G to the absorber C by resents the steam boiler,

refrigerating pipes connected gas passes from the cooler the pipe 12. H rep- I the furnace'thereof and 20 the pipe through which the hot waste gases escape fromthe furnace.

This

pipe is connected with a heating casing or chamber K in which the st-i so as tobe heated by the h through this chamber. A

nected with the outlet of this necessary, to expedite the gases.

ll A is arranged ot gases flowing fan 21 is conchamber, if

flow of the hot For providing the still with a large and efficient heating surface the still A is 7 preferably provided with depending tubes 22 which connect the body 23 of the still with a bottom chamber or header 24. 25 represents a by-pass or passage which connects the inlet passage 26 of the heating chamber K directly a portion of the hot gases rectly to the outlet without with its outlet passage 27 so that can be sent dipassing through the heating chamber, if the volume of hot gases is greater than that which is required for producing the desired h The supply of hot chamber is regulated ranged in the inlet 26 her and a pass 25, which one is closed bya gases to the heating damper 3O arof the heating chamdamper 31 arranged in the by dampers are so arranged that when the other is open. The

position of these dampers is automatically regulated by 32 which is an actuating or shifting device controlled by a thermostat 33 extending into the still. The damper actuating device which piston operated by 32 is preferably of the type comprises a movable diaphragm or compressed air which is supplied to a tank or reservoir 34, and

which passes from said tank stat by a. pipe'35 and from to the thermothe latter to the actuating device by a pipe 36. If the temperature in the still rises above the normal the supply damper 30 is correspondingly closed and the by-pass damper 31 correspondingly opened. If the temperature in the still drops below the normal the reverse action takes place.

In order to prevent K from being supplied with gas at such an excessively high temperature that the, temperature of the still cannot be satisfactorily controlled by the described damper mechanism, the heat conduit or pipe 20 is provided with an air inlet 40 through which air can be admitted to this pipe for reducing the temperature of the hot gases before the latter reach the still. This air inlet is provided with a damper 41 which is actuated by a shifting device 42,'similar to the device 32, and a thermostat 43 extending into the smoke pipe 20. Compressed air passes to the thermostat from the tank 34 by a pipe 44 and from the thermostat to the actuating device 42 by a pipe 45. The thermostat43 is so adjusted that when the temperature in the pipe 20 exceeds the permissible limit it causes the opening of the damper 41 in the air inlet 40 to such an extent as to reduce .the temperature to the proper point.

' The steam boiler H furnishes the steam for the machinery of the cold storage warehouse, brewery or other establishment in which the refrigerating apparatus is used. The hot waste gases from the boiler furnace ammonia stilland as the temperature of'these gases is considerably above that which is maintained in the still and the volume of the gases is comparativel large, the desired heating effect is readlly produced without. requiring the consumption of additional fuel, thus effecting an important economy in the process, while the cost of the apparatus is not materially increased. Y

In the apparatus representedin Fig. 2,v the hea chamber K in which the still A is stllilpplied with hot gases from an internal co ustion. engine the exhaust port of which is connected with the pipe 20 by which the hot gases are conducted to the heating chamber of the still. In the construction'of the still represented in this figure, the body 23 is provided with deis arrang the heating chamber pending tubes 51 which areclosed at their lower ends.

Stills of the construction herein shown and described are suitable for the purpose but I do not wish to limit myself to the same since the construction may be varied in many .ways without departing from the invention.

I claim as my invention:

1. The combination with an ammonia still, of an apparatus in which fuel is burned, a heating chamber for the still, a conduit for conducting the hot gases from such apparatus to said chamber, said conduit being provided with an air inlet and a by-pass, dampers in said conduit and bypass, automatic means for controlling said dampers by the temperature of the still, a damper controlling said air inlet, and automatic means for controlling said damper by the temperature of the gases in said conduit, substantially as set forth.

2. The combination with an ammonia still, of an apparatus in which fuel is burned, a conduit for the hot gases passing off from the fuel, a heating chamber for the still which receives the hot gases from said conduit, means thermostatically controlled by the temperature of the still for regulating the supply of hot gases to the still, and means thermostatically controlled by the temperature of the hot gases in the conduit for admitting air to said conduit, substantially as set forth.

3. The combination with an ammoniastill, of an apparatus in which fuel is burned, a conduit for the hot gases passing off from the fuel, a heating chamber for the still located in said conduit through which said gases are adapted to pass, a by-pass in said conduit leading around said chamber,

means thermostatically controlled by the temperature of said still for regulating the supply of the hot gases to said chamber and to said by-pass, and means thermostatically controlled by the temperature of the hot gases in the conduit for admitting air to the conduit, substantially as set forth.

Witness my hand in the presence of two subscribing witnesses. ABBY S. DAVIS.

Witnesses: I a

EDWARD WILHEIJM,

C. B. HORNBECK. 

